Data Guard Question

I have set up a data guard configuration on two separate Solaris Servers and am using Data Guard Manager via the Enterprise Manager to do the switchover and failover testing.

The Data Guard Manager is easy to use and fairly intuitive.

One of the databases on site uses data guard, but there is

1. a unix virtual host
2. a switchover routine activated using Unix scripts.
3. a change and restart of the listener required in case of switchover/failover.

The DBA claims that this set up was suggested by Oracle. Unfortunately, efforts to use Data Guard Manager on this set up have failed.

Anyone use a unix virtual host and a unix script driven failover/switchover process?

Any advantages or disadvantages versus Data Guard Manager?